diff options
Diffstat (limited to 'cpukit/score/src/corespinlockrelease.c')
| -rw-r--r-- | cpukit/score/src/corespinlockrelease.c | 21 |
1 files changed, 20 insertions, 1 deletions
diff --git a/cpukit/score/src/corespinlockrelease.c b/cpukit/score/src/corespinlockrelease.c index 05aec32c4c..46aa7c1105 100644 --- a/cpukit/score/src/corespinlockrelease.c +++ b/cpukit/score/src/corespinlockrelease.c @@ -30,7 +30,10 @@ * Input parameters: * the_spinlock - the spinlock control block to initialize * - * Output parameters: NONE + * Output parameters: + * CORE_SPINLOCK_SUCCESSFUL - if successful + * error code - if unsuccessful + * */ CORE_spinlock_Status _CORE_spinlock_Release( @@ -40,14 +43,30 @@ CORE_spinlock_Status _CORE_spinlock_Release( ISR_Level level; _ISR_Disable( level ); + + /* + * It must locked before it can be unlocked. + */ if ( the_spinlock->lock == CORE_SPINLOCK_UNLOCKED ) { _ISR_Enable( level ); return CORE_SPINLOCK_NOT_LOCKED; } + + /* + * It must locked by the current thread before it can be unlocked. + */ + if ( the_spinlock->holder != _Thread_Executing->Object.id ) { + _ISR_Enable( level ); + return CORE_SPINLOCK_NOT_HOLDER; + } + /* + * Let it be unlocked. + */ the_spinlock->users -= 1; the_spinlock->lock = CORE_SPINLOCK_UNLOCKED; the_spinlock->holder = 0; + _ISR_Enable( level ); return CORE_SPINLOCK_SUCCESSFUL; } |